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1 /*
2  * Copyright (C) 2020 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.car.audio.hal;
18 
19 import android.media.AudioAttributes.AttributeUsage;
20 
21 /**
22  * Framework focus listener interface to abstract away the specific HAL version
23  */
24 public interface HalFocusListener {
25     /**
26      * Requests audio focus for the specified {@code usage}, {@code zoneId}, and {@code focusGain}.
27      * <p>The result will be communicated separately through
28      * {@link AudioControlWrapper#onAudioFocusChange}.
29      */
requestAudioFocus(@ttributeUsage int usage, int zoneId, int focusGain)30     void requestAudioFocus(@AttributeUsage int usage, int zoneId, int focusGain);
31 
32     /**
33      * Abandons audio focus for the specified {@code usage} and {@code zoneId}.
34      * <p>The result will be communicated separately through
35      * {@link AudioControlWrapper#onAudioFocusChange}.
36      */
abandonAudioFocus(@ttributeUsage int usage, int zoneId)37     void abandonAudioFocus(@AttributeUsage int usage, int zoneId);
38 }
39